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There are many benefits to adding a second hard drive to your laptop such as improved speeds, greater storage space, and less heartache when installing new software. Use this guide to install one using our optical bay hard drive enclosure.

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For certain repairs (e.g. hard drive), disconnecting the battery connector is not necessary but it prevents any accidental shorting of electronics on the motherboard. If you do not disconnect the battery connector, please be careful as parts of the motherboard might be electrified.

Use the edge of a spudger to pry the battery connector upwards from its socket on the logic board.

It is useful to pry upward on both short sides of the connector to "walk" it out of its socket.

I have a Macbook Pro 15″ (late 2011) running OS Sierra with 128GB SSD in the main bay and a 1TB Toshiba MQ01ABD100 HDD Sata II (3Gb/s) in the optical bay. Both formated as Mac OS Extended Journaled. OS and apps are running fine from the SSD, however the HDD is behaving odd: I can’t write anything on it, even when permissions say “anyone can read and write”. I got error code -50. Sometimes, the drive icon takes a while to appear in my desktop. I already:

– Replaced the optical drive flex cable.

– Tested the HDD as external drive via USB connection. (It works)

– Relaunched the finder.

– Reset SMC and PRAM.

As the optical drive was “out of service” long before I made the dual drive setup, I begun to think it might be a problem with the computer hardware itself, but then I remembered my logic board was replaced by Apple only few months ago. And a friend told me he succesfully did the dual setup regardless his optical drive wasn’t working.